To submit your cover, begin by going to to Submit in the top-level toolbar.
Once there, click on the Submit Cover button.
This will open the Cover Submission page. Here, you will be asked to verify the information about the cover.
Once you have verified the information, you will have to check the box at the bottom of the screen and then press Submit Cover.
Once you do this, you will see a check box appear on your cover, indicating that it has been submitted.